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All wood can be divided into two categories: “hard” or “soft”, according to its weight in kg per cubic meter of wood.
Softwood, weighing approx. 300-350 kg/m³, includes spruce, pine, poplar, alder, chestnut and willow. It burns more rapidly, producing greater heat: this makes it ideal for starting the fire, although if used as the main fuel, the stove will require more frequent refilling.
Hardwood, weighing approx. 350-400 kg/m³, includes elm, oak, holm oak, beech and ash. It is generally denser and less resinous than softwoods; for this reason it burns more slowly, producing longer-lasting heat.
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